.wrapper{

    padding: 10px;
    width: 1200px;
    margin: 20px auto;
    border: 1px solid #000;
}
.wrapper h2{
    font-weight: normal;
    height: 40px;
    border-bottom: 3px solid #4595e6;
    color: #4595e6;
    font: 'Microsoft YaHei';
    margin-bottom: 10px;
}
.wrapper .center{
    box-sizing: border-box;
    padding: 10px;
}
.wrapper .center li{
    width: 100%;
    height: 100%;
    border: 1px solid #000;
    margin-bottom: 10px;
    display: flex;
    align-items: center;
    justify-content: space-between;
}
.wrapper .center li .select,
.wrapper .center li .show,
.wrapper .center li .delete{
    width: 100px;
}
.wrapper .center li .title{
    flex:1;
}